“At the global level, scenarios reaching 450 ppm CO2eq are
also characterized by more rapid improvements of energy efficiency,a tripling to nearly a quadrupling of the share of zero‐ and low‐carbon energy supply from renewables, nuclear energy and fossil energy with carbon dioxide capture and storage (CCS), or bioenergy with CCS (BECCS) by the year 2050″ IPCC WGIII.